INDEX. 323 
Page. 
Petrahed rl te vec o2ic.c 2s edccummenaineaesedocis 246 | Varingose........---.---2--+ 
Theralite 83 | Vermiculite 
Thomsonite 286. || “Vesuviamil eax ccccsnccmccrcooccutsiecinte nection 
IG Ic on aie ema vaaiamadetad meant 2158901 117) |} Viegzenose 2.cccscscaccsresenscuencasactacueae 
Tinguaite porphy-y.................2..2002- 87 | Vitrophyre.. 
Pitan be wacractinsis ere creatiic sree eee aeexemerseei 209. Wogesitet ian icisicis snacininntis srieneweucceme 
Monalase siatcist checactncoueeaceg seaeaeemnnene 33 | Volcanic ash 
Monat s, onsiecast voseew eeaseng eee eee 21 | Volcanic bombs 142,181 
Tonalite-aplite.........2. 0200.0... eee eee eee 178 | Volcanic dust...-.-.. 179,180 
Tonalose.......-.-...-. 13, 33, 60, 61, 62, 65, 66, 72,76, | Volcanic glass. .... 76 
94, 111, 113, 115, 116, 119, 124, 126, 130, 131,183, | Volcanic sand..... -- 76,97,142,179 
135, 140, 141, 142, 143, 144, 145, 146, 148, 149,150, | Vulcanose............- 35,154 
151, 152, 155, 159, 168, 169, 172, 173, 175, 176, 179 
POP As sinc cc cncemcmsentenercumen veseeesees 273 
Tordrillit@c.s.« asters ncaccatnmessaee ties 134,177 
MOSCANOSE xs swig eeint ewes ce mrercinonsicaeieinesie 15, 
16, 22, 23, 33, 35, 38, 40, 50, 52, 64, 70, 72, 78, 79, 
80, 83, 84, 92, 93, 95, 103, 105, 106, 108, 109, 110, 
111, 113, 115, 117, 118, 122, 125, 126, 130, 132, 134, 
138, 144, 145, 148, 152, 155, 157, 163, 164, 165, 177 
Tootmaline..c.cccocccsecnexs eadekcecaae 278, 279, 280 
Tourmaline-biotite schist.....-..-.---------- 57 
Trachyandesite .....-..---....--0--eee eee 
Trachy dolerite 
Trachyte.......- 
PrachyteanQesi 0.2 cncnasspacnnen sn eelinn 67 
Trachytic phonolite.....--....-------++-+--- 101 
Trachytic rhyolite........-..-.--.-+--+-++--+ 71 
TravertiN@rs.0ii<o+cecemisss ena zens 201, 202 
TremOlit@ss sasewezeanes ne vee ewemiemieis ie aes 264, 265 
MDM tO sc «.n:c, soe nisin SARE Sees eN 303 
THOU Ces ass cpoersteeracpravieinnoe aoe SRR ES 239, 240 
Tscheffkinite...........----- diseases 299 
Tuff.......-- . 13,71, 86, 106, 139, 163, 171 
22,155,174 
304 
306 
251 
U. 
10) -o-< [eee eee 301 
Umptekose.......--2.0eccceeeceseeseesee 15, 82, 178 
Uralite diorite. 
Uraninite.... 
Urao.... 
Uvaldose.ccicciccsccucccceevciersicccce 
Vv. 
Vaalos@ ee cccecxeengemedszcemmninicidemas 113, 126 
Vaialoses...asevesscscccexpescces beeese 23,151,172 
O 
291 
246 
Warwitkite 2.c:cc:caccsnwsiia sen emaiests seaiscem 301 
Websterite sciw cin ceweescses sev eecckvoee se 
Wehrlite.... 
Wehrlose.... 
Wollastonite gneiss. 
W YOUMUNGAS6 nee ar2ns ssa seraee ts eee en 
Wyomingite. - 
WY OMUINB OSC. i5.cScacsicls cn 2eeca cae mmmimiecisis 
aX. 
Man thitan e sisisc scawin- eessnntmn sae svicisaecwinet 299 
Ran thophylite vic vic caceassivcciaccievcnsie ces 291 
MOCNOUMC s + esenecseeeeeerscswessesermeees se 302 
Yi; 
Yellowstonose.....-....---.---- 17, 30, 33, 61, 62, 64, 
65, 72, 93, 96, 98, 108, 109, 110, 111, 113, 115, 130, 
135,136, 140, 142, 144, 148, 149, 160, 170, 171, 179 
ViGBOUWG': cnisiciccnnss nesnneeccssiseeeeemnme cere 91 
VUETIAl it Oboe epi screctstessiaicixisie cst nitrates, 275 
Yukon t6 ave cucewsceqecesesacie ce oenceras 178 
YuURKONOS6: occ ikeeeaceermesssevececseeee 144,178 
Z. 
Winkenlteisscc.crescecrweceas voseescimeces sess 245 
Zinnwaldite.....-...-. Eonnemtaude Seemeiveetee 287 
Zoisite - 272 
Zoisite-hornblende diorite...........-------- 126 
TUBVitC cer seneagetes se esse ccenmeieeeseasees 269 
